Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: P15: Polymers and Fields
CPP 50.7: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
On-surface polymerization of flexible molecular wires — Christophe Nacci1,2, Francisco Ample3, David Bleger4, Stefan Hecht4, Christian Joachim5, and •Leonhard Grill1,2 — 1Fritz-Haber-Institute, Berlin, Germany — 2Department of Physical Chemistry, University of Graz, Austria — 3IMRE, Singapore — 4Department of Chemistry, Humboldt-Universität zu Berlin, Germany — 5CEMES-CNRS, Toulouse, France
The on-surface polymerization of molecular building blocks on a Au(111) surface is studied by scanning tunneling microscopy and spectroscopy at low temperatures in combination with calculations. While rather rigid molecular chains, such as graphene nanoribbons, have been grown successfully in the last years, flexible molecular wires remain still a challenge. A key issue is here the charge transport capability through the molecule. Chemical linking is achieved by attachment of halogen substituent atoms at specific molecular sites in the ex-situ synthesis. After deposition under ultrahigh vacuum conditions onto the surface, the chemical reaction is induced by sample heating. We show the successful formation of a flexible polymer that contains various sub-units with characteristic properties directly on the surface. The electronic structure of the molecular wire is studied by spatial mapping of individual molecules.